JPH0524377B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a control valve for an automatic transmission.

(b) Prior Art A conventional control valve for an automatic transmission is disclosed in Japanese Utility Model Application Publication No. 60-64351. The automatic transmission control valve shown here is constructed so that a spring that applies force to a spool inserted into a valve hole is supported by a retainer. The retainer is inserted into a groove provided in a direction perpendicular to the valve hole, and is pressed against one wall of the groove by the reaction force of the spring. Because a separate valve body is assembled on the opening side of the groove with a separate plate,
After assembling the valve body, there is no risk of the retainer falling out.

(c) Problems to be Solved by the Invention However, the conventional automatic transmission control valve as described above has a problem in that fine adjustment of the spring force is extremely troublesome. That is, for example, in the case where the spool on which the force of the spring held by the retainer acts has a pressure regulating effect, if the pressure regulating value obtained by this is not as desired, it is necessary to replace the spring. Or, by installing a spring seat or changing the thickness of the spring seat, the desired pressure regulation value can be adjusted. To do this, it is necessary to disassemble the two valve bodies that make up the control valve, then take out the retainer, and replace the spring. Disassembling the control valve requires removing many bolts, which takes a long time. Furthermore, if a gasket is interposed between the valve body and the separate plate, the gasket must be replaced every time it is disassembled, resulting in wear and tear on the parts. The present invention aims to solve these problems.

(d) Means for Solving the Problems The present invention solves the above problem by making it possible to attach and detach the retainer through the communication hole that is always open in the groove, and by preventing the retainer from slipping out from the communication hole in the installed state. Release problems.

That is, the control valve for an automatic transmission according to the present invention includes: a valve hole 22 provided in the valve body 14 and having an open end on one side; a spool 24 accommodated in the valve hole 22 so as to be movable in the axial direction; Spool 24 in hole 22 and valve hole 2
a spring 26 provided between the open end of the valve hole 22 and the spool 24 to apply a pressing force to the spool 24; a groove 38 provided near the open end of the valve hole 22 and perpendicular to the axial direction of the valve hole 22; The spring 26
A control valve for an automatic transmission having a plate-shaped retainer 28 that supports a reaction force, and a communication hole that communicates with the groove 38 and maintains an open state even after the control valve is assembled so that the retainer 28 can be attached or detached. 40 is provided, and a part of the retainer 28 is cut out to form the valve hole 22.
A stopper 42 formed by bending the open end side is provided, and the spring 26 pushes the retainer 28 into the valve hole 22.
By pressing toward the open end, the stopper 42
is locked to the inner wall of the valve hole 22 and the retainer 28
It is characterized in that it is configured to prevent it from coming off from inside the groove 38.

Separately from the stopper 42, the retainer 28 is provided with a protrusion 52 formed by cutting out and bending a part,
A shim 50 for adjusting the size of the spring 26 can be locked to this protrusion 52.

(e) Action When the retainer is installed in the groove, its stopper protrudes from the groove into the valve hole, so even if a force is applied in a direction parallel to the surface of the retainer, it will not move from the communication hole of the groove. There's no getting out of it. On the other hand, when replacing the spring for fine adjustment of the spring force, move the retainer in the axial direction of the valve hole against the spring force, release the engagement of the stopper with the valve hole, and then You can take it out through it. When assembling, just do the reverse of the above. Since the above operation can be carried out through the communication hole which is always open, there is no need to disassemble the entire control valve. Therefore, the spring force can be adjusted by only working on the minimum necessary parts. Additionally, there is no need to replace gaskets when disassembling the control valve.

(F) Embodiment The control valve 10 is assembled by tightening an upper valve body 12 and a lower valve body 14 with a number of bolts 16, as shown in FIG. A separate plate 18 is interposed between the upper valve body 12 and the lower valve body 14, and gaskets are provided on both sides of the separate plate 18 as necessary.

As shown in FIG. 1, the lower valve body 14
A pressure regulating valve 20 is provided. The pressure regulating valve 20 has a spool 2 inserted into a valve hole 22.
4 and a spring 26 that applies a pushing force to it.
and a retainer 28 that holds the spring 26. Valve hole 2 in lower valve body 14
Oil grooves 30, 32, 34, and 3 communicating with 2
6, and a groove 38 are provided. Oil groove 3
0, 32, 34, and 36 are open only on the side facing the separate plate 18, and the lower side in FIG. 1 is closed. However, only the groove 38 passes through the lower valve body 14 from the upper surface to the lower surface, and a communication hole 40 is formed on the lower side in the figure. The retainer 28 has a shape as shown in FIG. 3, and has a stopper 42 formed by cutting out and bending a portion.

Next, the operation of this embodiment will be explained. 1st
The pressure regulating valve 20 assembled as shown in the figure performs a pressure regulating action by a well-known pressure regulating action so that the oil pressure in the oil groove 30 is balanced with the force of the spring 26. That is, using the hydraulic pressure supplied to the oil groove 32 as a hydraulic pressure source, a part of this is discharged into the oil groove 36 to adjust the oil pressure in the oil groove 34, and this is fed back to the oil groove 30, thereby achieving the above-mentioned effect. A pressure regulating effect like this can be obtained. If the oil pressure obtained by this pressure regulating action is not as desired, it is necessary to replace the spring 26 and make fine adjustments. In this case, as shown in FIG. 4, the retainer 28 is pushed by the rod 44 so that it is not caught in the stopper 42 or the valve hole 22,
Pull out the retainer 28 from the communication hole 40 side. This allows the spring 26 to be taken out from the valve hole 22. Next, another spring 26 having a predetermined specification is inserted into the valve hole 22 and compressed, and the retainer 28 is inserted through the communication hole 40 to return to the state shown in FIG. 1. Thereby, the spring 26 can be replaced by disassembling only the pressure regulating valve 20 portion. Therefore, it is not necessary to remove the numerous bolts 16 shown in FIG. 2, separate the upper valve body 12 and lower valve body 14, replace the spring 26, and then reassemble them. Note that the groove 38 has a communication hole 4.
0 is provided, but since this groove 38 is always drained without hydraulic pressure acting on it, no problem will occur due to the provision of the communication hole 40. In addition,
Although the retainer 28 is removed by pushing it with the rod 44, it may also be removed by pinching it by hand.

In the above embodiment, the oil pressure value was finely adjusted by replacing the spring 26, but by providing a shim for size adjustment between the end of the spring 26 and the spool 24, or Fine adjustment can also be made by changing the thickness of the . Further, as shown in FIG. 5, a shim 50 may be provided between the retainer 28 and the end of the spring 26, and the retainer 28 may be provided with a protrusion 52 for holding the shim 50. Furthermore, as shown in Fig. 6, groove 38
It is also possible to provide a shim 50 between the wall surface of the retainer 28 and the retainer 28.

(G) Effects of the Invention As explained above, according to the present invention, the retainer can be attached and detached through the normally open communication hole in the valve body, so when finely adjusting the spring force, it is not necessary to disassemble and reassemble the entire control valve. No assembly work is required, greatly improving work efficiency. Furthermore, in the case of a control valve that uses a gasket, the gasket that is consumed during disassembly work can be saved. Further, since the retainer originally has a simple plate shape, a stopper can be easily formed by cutting out a part of the retainer and bending it. The retainer is pressed toward the open end of the valve hole by a spring, and the stopper can be locked by the inner wall of the valve hole, which is originally formed for inserting the spool, so the retainer is pressed against the valve body side. It is possible to reliably prevent the retainer from coming off by simply forming a small stopper on the retainer, without requiring a new special structure for retaining the retainer. Since the stopper only needs to be small, it can be easily attached and detached from the communication hole, resulting in good workability. Furthermore, the dimensions of the spring can be easily adjusted using shims. That is, the protrusion can be easily formed by cutting out and bending a part of the retainer, and it is only necessary to lock the shim to the protrusion and install it in the groove.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention, Fig. 2 shows the structure of a control valve, Fig. 3 shows a spring retainer, and Fig. 4 shows a state in which the spring retainer is being removed. , FIG. 5 is a diagram showing another embodiment, and FIG. 6 is a diagram showing still another embodiment. 14... Valve body, 22... Valve hole, 2
4...Spool, 26...Spring, 28...
Retainer, 38... Groove, 40... Communication hole, 42
...Stotsupa.

Claims (1)

[Claims] 1. A valve hole 22 provided in the valve body 14 and having an open end on one side; a spool 24 accommodated in the valve hole 22 so as to be movable in the axial direction; and a spool 24 inside the valve hole 22. and valve hole 2
a spring 26 provided between the open end of the valve hole 22 and the spool 24 to apply a pressing force to the spool 24; a groove 38 provided near the open end of the valve hole 22 and perpendicular to the axial direction of the valve hole 22; The spring 26
A control valve for an automatic transmission having a plate-shaped retainer 28 that supports a reaction force, and a communication hole that communicates with the groove 38 and maintains an open state even after the control valve is assembled so that the retainer 28 can be attached or detached. 40 is provided, and a part of the retainer 28 is cut out to form the valve hole 22.
A stopper 42 formed by bending the open end side is provided, and the spring 26 pushes the retainer 28 into the valve hole 22.
By pressing toward the open end, the stopper 42
is locked to the inner wall of the valve hole 22 and the retainer 28
A control valve for an automatic transmission, characterized in that the control valve is configured to prevent the valve from slipping out of the groove 38. 2. The retainer 28 is provided with a protrusion 52 formed by cutting out and bending a part of the retainer 28 in addition to the stopper 42, and a shim 50 for adjusting the size of the spring 26 is locked to the protrusion 52. automatic transmission control valve.